Aspects of warm-flat directions

TL;DR

This paper explores how dissipation in SUSY-flat directions during warm inflation can significantly alter cosmological scenarios, especially through the Affleck-Dine mechanism and alternative curvature perturbation sources.

Contribution

It demonstrates that dissipation can cause substantial deviations from conventional SUSY-flat direction models, highlighting its impact on cosmological evolution and perturbation generation.

Findings

Dissipation affects SUSY-flat directions in warm inflation.

Significant discrepancies in Affleck-Dine mechanism due to dissipation.

Dissipative fields can generate cosmological perturbations.

Abstract

Considering the mechanism of dissipative slow-roll that has been used in warm inflation scenario, we show that dissipation may alter usual cosmological scenarios associated with SUSY-flat directions. We mainly consider SUSY-flat directions that have strong interactions with non-flat directions and may cause strong dissipation both in thermal and non-thermal backgrounds. An example is the Affleck-Dine mechanism in which dissipation may create significant (both qualitative and quantitative) discrepancies between the conventional scenario and the dissipative one. We also discuss several mechanisms of generating curvature perturbations in which the dissipative field, which is distinguished from the inflaton field, can be used as the source of cosmological perturbations. Considering the Morikawa-Sasaki dissipative coefficient, the damping caused by the dissipation may be significant for many MSSM flat directions even if the dissipation is far from thermal equilibrium.